1. Priming
(1) The primer of gantry crane shall be applied in a clean and dry place, the ambient temperature shall not be lower than 5 ℃, and the relative humidity shall be lower than 80~85%. During outdoor construction, it is forbidden to spray (brush) paint in the hot sun, rain, fog and sand.
(2) Apply one coat of primer according to the technical requirements. If it is necessary to apply two coats of primer, it must be dried before the last coat. Generally, the drying time is 24~48 hours at the temperature of 18 ℃ ~23 ℃.
2. Topcoat
(1) Whether it is L-shaped gantry crane, large gantry crane, engineering gantry crane, etc., the finish paint of gantry crane must be thoroughly dried after the primer is applied (the drying time is 24-48 hours at 18 ℃ ~23 ℃).
(2) Before painting the top coat of gantry crane, the oil stain and dust on the primer surface must be removed to make the surface clean (after degreasing, it should be dried at 18 ℃ ~23 ℃ for 0.2~0.3 hours) and there should be no moisture, dew frost and moisture layer.
(3) The finish paint shall be applied when the relative humidity is 40~70% and the temperature is 12 ℃ ~25 ℃. During outdoor construction, it is forbidden to brush and paint in the hot sun and sand.
(4) If it is required to apply two coats of finish paint, the second coat of finish paint can be applied only after the last coat of finish paint is dry (the drying time is 24 hours at 18 ℃ ~23 ℃).
